That would have to be the inadvertent spin I got into on my 2nd out-of-the-pattern solo flight--and I hadn't been taught spin recovery.
I was attempting MCA and was in the worst possible configuration for a recovery--power in, 40° of flaps. Stall horn's blaring, left wing drops, ailerons aren't doing squat and into the spin I go.
Staring at the rotating dirt in the windscreen, power and full flaps still in, my saving grace was that my buddy who I rode down to the airport with (who was further along in his training, in his XC phase, I think--nowadays, he's one of those ascot-wearing Viper drivers
) and I had just so happened to have discussed spin recoveries on the drive down to PVU that morning (we were both from SLC) and in one of those rare moments of clarity, I remembered that discussion and stomped on the opposite rudder and then pulled out of the resulting dive.
Remember, this was back in the days when people routinely soloed in 7-10 hrs, underprepared for most emergencies like this. In retrospect, the reason for my stall/spin was that I hadn't yet been taught proper rudder control and was undoubtedly woefully uncoordinated in flight.
It rattled my cage pretty good, but makes for a good "I learned about flying from that" story.